Update Ironbank

This MR contains the following updates:

Package	Update	Change
registry1.dso.mil/ironbank/opensource/kubernetes/kubectl (source)	patch	v1.32.4 -> v1.32.5
registry1.dso.mil/ironbank/opensource/mattermost/mattermost (source)	minor	10.7.2 -> 10.8.0

Complete MR checklist

Assignee

• Followed upgrade instructions outlined in docs/DEVELOPMENT_MAINTENANCE.md
• Update Docs with new/updated steps as needed
• Tested and Validated Changes made with supporting info like logs or screenshots from test pipelines

Add supporting info below

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• Tested and Validated changes

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Upgrade Notices

N/A

Testing

$ kubectl get pods,vs -n mattermost
NAME                              READY   STATUS    RESTARTS   AGE
pod/mattermost-6fccd9d497-v72mt   2/2     Running   0          3m23s
pod/mattermost-minio-pool-0-0     3/3     Running   0          3m18s
pod/mattermost-postgresql-0       2/2     Running   0          3m25s